Lens assembly driving module, photographing system and cell phone device

ABSTRACT

A lens assembly driving module includes a holder, a metal yoke, a lens unit, a magnet set, a coil, at least one elastic element and at least one damper agent. The metal yoke is coupled with the holder and includes a through hole and at least one extending structure. The extending structure is disposed around the through hole and extends along a direction from the through hole to the holder. The lens unit is movably disposed in the metal yoke. The lens unit includes an optical axis and at least one notch structure. The notch structure is disposed in an outer peripheral area of the lens unit and is corresponding to the extending structure. The damper agent is disposed between the extending structure of the metal yoke and the notch structure of the lens unit. The damper agent is applied to damp a movement of the lens unit.

RELATED APPLICATIONS

This application claims priority to Taiwan Application Serial Number107107941, filed Mar. 8, 2018, which is herein incorporated byreference.

BACKGROUND Technical Field

The present disclosure relates to a lens assembly driving module and aphotographing system. More particularly, the present disclosure relatesto a lens assembly driving module and a photographing system applicableto a portable cell phone device.

Description of Related Art

With the popularity of personal electronic products and mobilecommunication products having camera functionalities, such as smartphones and tablet personal computers, the demand for compact electronicdevices with high resolution and high image quality also increasessignificantly.

Nowadays, a lens assembly employed in an electronic device normallyadopts a voice coil motor (VCM) as a driving apparatus for providingautofocus function. With an electromagnetic force generated by theinteraction of magnets and a coil, and with the degree of freedom andthe restoring force provided by springs which are required by themovement of the carrier carrying the lens assembly, the carrier isdriven by the voice coil motor to bring the lens assembly to move alonga direction parallel to an optical axis, so that the autofocusfunctionality of the lens assembly can be achieved.

For damping a movement of the lens assembly, a damper agent can beemployed. However, limited by the mechanical arrangement, it isdifficult for a conventional driving apparatus to control the coatingamount and the coating efficiency of the damper agent. Accordingly, itis unfavorable for reducing the production cost, the production yieldrate, and the production efficiency.

SUMMARY

According to one aspect of the present disclosure, a lens assemblydriving module includes a holder, a metal yoke, a lens unit, a magnetset, a coil, at least one elastic element and at least one damper agent.The holder has an opening. The metal yoke is coupled with the holder.The metal yoke includes a through hole and at least one extendingstructure. The through hole is corresponding to the opening of theholder. The extending structure is disposed around the through hole, andthe extending structure extends along a direction from the through holeto the holder. The lens unit is movably disposed in the metal yoke. Thelens unit includes an optical axis and at least one notch structure. Theoptical axis is corresponding to the through hole. The notch structureis disposed in an outer peripheral area of the lens unit. The notchstructure is corresponding to the extending structure. The magnet set isdisposed in the metal yoke. The coil is disposed at an exterior of thelens unit, and the coil is corresponding to the magnet set. The elasticelement is coupled with the lens unit and the holder. The damper agentis disposed between the extending structure of the metal yoke and thenotch structure of the lens unit, wherein the damper agent is applied todamp a movement of the lens unit.

According to another aspect of the present disclosure, a photographingsystem includes the lens assembly driving module according to theaforementioned aspect.

According to further another aspect of the present disclosure, a cellphone device includes the photographing system according to theaforementioned aspect.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure can be more fully understood by reading thefollowing detailed description of the embodiments, with reference madeto the accompanying drawings as follows:

FIG. 1A is a three-dimensional view of a lens assembly driving moduleaccording to the 1st embodiment of the present disclosure;

FIG. 1B is another three-dimensional view of the lens assembly drivingmodule in FIG. 1A;

FIG. 1C is an exploded view of the lens assembly driving module in FIG.1A;

FIG. 1D is another exploded view of the lens assembly driving module inFIG. 1A;

FIG. 1E is a top view of the lens assembly driving module in FIG. 1A;

FIG. 1F is a cross-sectional view taken along line 1F-1F of the lensassembly driving module in FIG. 1E;

FIG. 1G is a cross-sectional view of a carrier and a coil in FIG. 1F ina combination state;

FIG. 1H is a cross-sectional view of a lens assembly in FIG. 1F;

FIG. 1I is a top view of a lens unit in FIG. 1C;

FIG. 1J is an enlarged view of a portion 1A′ shown in FIG. 1A;

FIG. 1K is an enlarged view of a portion 1B′ shown in FIG. 1A;

FIG. 1L is an enlarged view of a portion 1C′ shown in FIG. 1C;

FIG. 1M is an enlarged view of a portion 1D′ shown in FIG. 1E;

FIG. 1N is an enlarged view of a portion 1E′ shown in FIG. 1G;

FIG. 2A is a three-dimensional view of a lens assembly driving moduleaccording to the 2nd embodiment of the present disclosure;

FIG. 2B is an exploded view of the lens assembly driving module in FIG.2A;

FIG. 2C is another exploded view of the lens assembly driving module inFIG. 2A;

FIG. 2D is a top view of the lens assembly driving module in FIG. 2A;

FIG. 2E is a three-dimensional view of a carrier in FIG. 2B;

FIG. 2F is another three-dimensional view of the carrier in FIG. 2B;

FIG. 2G is a top view of the carrier in FIG. 2B;

FIG. 2H is an enlarged view of a portion 2A′ shown in FIG. 2A;

FIG. 2I is an enlarged view of a portion 2B′ shown in FIG. 2A;

FIG. 2J is an enlarged view of a portion 2C′ shown in FIG. 2B;

FIG. 2K is an enlarged view of a portion 2D′ shown in FIG. 2B;

FIG. 2L is an enlarged view of a portion 2E′ shown in FIG. 2B;

FIG. 2M is an enlarged view of a portion 2F′ shown in FIG. 2D;

FIG. 2N is an enlarged view of a portion 2G′ shown in FIG. 2D;

FIG. 2O is an enlarged view of a portion 2H′ shown in FIG. 2E;

FIG. 2P is an enlarged view of a portion 2I′ shown in FIG. 2E;

FIG. 3A is a schematic view showing a cell phone device according to the3rd embodiment of the present disclosure;

FIG. 3B is another schematic view of the cell phone device in FIG. 3A;

FIG. 3C is a block diagram of the cell phone device in FIG. 3A;

FIG. 4 is a schematic view of a cell phone device according to the 4thembodiment of the present disclosure; and

FIG. 5 is a schematic view of a cell phone device according to the 5thembodiment of the present disclosure.

DETAILED DESCRIPTION

According to the present disclosure, a damper precursor refers to amaterial of a damper agent before being cured via a light irradiation.That is, the damper agent is a product of the damper precursor beingcured via the light irradiation. The damper precursor is in a liquidstate, and the damper agent is in a gel state. Furthermore, because thedamper agent is the product of the damper precursor being cured via thelight irradiation, the coating amount and the coating efficiency of thedamper agent also can be regarded as the coating amount and the coatingefficiency of the damper precursor.

According to the present disclosure, the damper agent in the drawings isfilled with dots, which is for easily identifying the damper agent andhas no special meanings.

According to the present disclosure, the terms of “first” and “second”are for nomination, and thus do not represent sequential order or havespecial meanings.

1st Embodiment

Please refer to FIG. 1A to FIG. 1F. FIG. 1A is a three-dimensional viewof a lens assembly driving module 100 according to the 1st embodiment ofthe present disclosure. FIG. 1B is another three-dimensional view of thelens assembly driving module 100 in FIG. 1A. FIG. 1C is an exploded viewof the lens assembly driving module 100 in FIG. 1A. FIG. 1D is anotherexploded view of the lens assembly driving module 100 in FIG. 1A. FIG.1E is a top view of the lens assembly driving module 100 in FIG. 1A.FIG. 1F is a cross-sectional view taken along line 1F-1F of the lensassembly driving module 100 in FIG. 1E. As shown in FIG. 1A to FIG. 1F,the lens assembly driving module 100 includes a holder 110, a metal yoke120, a lens unit 130, a magnet set 160, a coil 170, at least one elasticelement (its reference numeral is omitted) and at least one damper agent190. Specifically, the metal yoke 120 is coupled with the holder 110 soas to form an accommodating space (its reference numeral is omitted).The accommodating space is configured to dispose the lens unit 130, themagnet set 160, the coil 170, the elastic element and the damper agent190.

In FIG. 1C, the holder 110 has an opening 111. The metal yoke 120includes a through hole 121 and at least one extending structure 122.The through hole 121 of the metal yoke 120 is corresponding to theopening 111 of the holder 110. The extending structure 122 is disposedaround the through hole 121, and the extending structure 122 extendsalong a direction from the through hole 121 to the holder 110.

Please refer to FIG. 1C, FIG. 1F and FIG. 1L. FIG. 1L is an enlargedview of a portion 1C′ shown in FIG. 1C. The lens unit 130 is movablydisposed in the metal yoke 120. The lens unit 130 includes an opticalaxis O (shown in FIG. 1F) and at least one notch structure 141. Theoptical axis O is corresponding to the through hole 121. The notchstructure 141 is disposed in an outer peripheral area (its referencenumeral is omitted) of the lens unit 130, and the notch structure 141 iscorresponding to the extending structure 122.

In FIG. 1C and FIG. 1F, the magnet set 160 is disposed in the metal yoke120. The coil 170 is disposed at an exterior of the lens unit 130, andthe coil 170 is corresponding to the magnet set 160.

In FIG. 1C, the elastic element is coupled with the lens unit 130 andthe holder 110, respectively. Specifically, the elastic element includesa first elastic member 181 and a second elastic member 182, wherein thefirst elastic member 181 is coupled with the lens unit 130, and thesecond elastic member 182 is coupled with the lens unit 130 and theholder 110, respectively. However, the present disclosure is not limitedthereto. The elastic element is for providing the degree of freedom andthe restoring force required by the movement of the lens unit 130.Accordingly, elastic elements which can provide the aforementionedfunction can be employed in the present disclosure.

Please refer to FIG. 1A, FIG. 1E, FIG. 1J, FIG. 1K and FIG. 1M. FIG. 1Jis an enlarged view of a portion 1A′ shown in FIG. 1A. FIG. 1K is anenlarged view of a portion 1B′ shown in FIG. 1A. FIG. 1M is an enlargedview of a portion 1D′ shown in FIG. 1E. The damper agent 190 is disposedbetween the extending structure 122 of the metal yoke 120 and the notchstructure 141 of the lens unit 130, wherein the damper agent 190 isapplied to damp a movement of the lens unit 130.

The optical axis O is corresponding to the through hole 121, whichrefers that the optical axis O and the through hole 121 arecorresponding to each other in function. Specifically, thecorrespondence in function between the optical axis O and the throughhole 121 allows a portion of the lens unit 130 to pass through thethrough hole 121, so that light is not shielded and can enter into thelens unit 130. For example, the optical axis O can pass through thethrough hole 121, or the through hole 121 and the optical axis O can becoaxial.

The coil 170 is corresponding to the magnet set 160, which refers thatthe coil 170 and the magnet set 160 are corresponding to each other infunction. Specifically, the correspondence in function between the coil170 and the magnet set 160 allows an electromagnetic force generatedtherebetween. In this embodiment, a surface (its reference numeral isomitted) of the coil 170 faces toward to the magnet set 160, which canenhance the electromagnetic force therebetween.

Specifically, in a focusing process, an electronic signal is firstlyobtained by the lens assembly driving module 100 according to light ofan imaged object entering into the lens unit 130. The electronic signalis then sent to an electronic driver (not shown), and the electronicdriver provides a current to the coil 170. With an electromagnetic forcegenerated by the interaction of the magnet set 160 and the coil 170, thelens unit 130 is driven to move along the optical axis O, so that theautofocus functionality of the lens unit 130 can be achieved. In theabove focusing process, when the lens unit 130 is driven to move, adegree of freedom of the lens unit 130 along the optical axis O can beprovided by the first elastic member 181 and the second elastic member182. The first elastic member 181 and the second elastic member 182 aredeformed along the movement of the lens unit 130, and provide arestoring force to the lens unit 130 when the lens unit 130 moves backto an initial position thereof.

With the aforementioned structure, the arrangement of the extendingstructure 122 and the notch structure 141 is favorable for obtaining anexpected control for the coating amount and the coating efficiency ofthe damper agent 190. Moreover, the damper agent 190 is disposed closelyto the through hole 121, so that the production difficulty can besignificantly reduced. Furthermore, the damper agent 190 can be coatedby a multi-point coating process which is a faster coating method, andan equally damping effect for damping a movement of the lens unit 130can be obtained.

Details of the lens assembly driving module 100 according to the 1stembodiment are provided hereinafter.

As shown in FIG. 1C, the extending structure 122 can be formed in a flatshape. Therefore, it is favorable for the damper precursor coated on theextending structure 122 to have an even thickness, so that theefficiency of irradiation curing can be enhanced.

As shown in FIG. 1C and FIG. 1F, the lens unit 130 can include a carrier140 and a lens assembly 150. The carrier 140 is movably disposed in themetal yoke 120, and the notch structure 141 is disposed in an outerperipheral area (its reference numeral is omitted) of the carrier 140.The optical axis O is defined by the lens assembly 150. The optical axisO is corresponding to an object-side central hole 144 (shown in FIG.1G), and the lens assembly 150 is coupled in the carrier 140. A movementof the lens assembly 150 relative to the holder 110 is according to amovement of the carrier 140. That is, in the 1st embodiment of thepresent disclosure, the lens assembly 150 is driven by the carrier 140so as to move relative to the holder 110. The optical axis O iscorresponding to the object-side central hole 144, which refers that theoptical axis O and the object-side central hole 144 are corresponding toeach other in function. Specifically, the correspondence in functionbetween the optical axis O and the object-side central hole 144 allowslight to enter into the lens assembly 150 through the object-sidecentral hole 144. For example, the optical axis O can pass through theobject-side central hole 144, or the object-side central hole 144 andthe optical axis O can be coaxial.

FIG. 1G is a cross-sectional view of the carrier 140 and the coil 170 inFIG. 1F in a combination state. In FIG. 1G, the carrier 140 can includean object-side portion 143 and at least three inner surfaces (145 a-145f). The object-side portion 143 has the object-side central hole 144.Each of the inner surfaces (145 a-145 f) has a diameter (ϕ1˜ϕ6). Thediameters of the inner surfaces are different from each other, and eachof the diameters of the inner surfaces is greater than a diameter ϕ0 ofthe object-side central hole 144. According to the 1st embodiment, thecarrier 140 includes six inner surfaces, which are an inner surface 145a, an inner surface 145 b, an inner surface 145 c, an inner surface 145d, an inner surface 145 e and an inner surface 145 f, respectively. Adiameter of the inner surface 145 a is ϕ1. A diameter of the innersurface 145 b is ϕ2. A diameter of the inner surface 145 c is ϕ3. Adiameter of the inner surface 145 d is ϕ4. A diameter of the innersurface 145 e is ϕ5. A diameter of the inner surface 145 f is ϕ6. Thediameter of the object-side central hole 144 is ϕ0. The diameters ϕ1-ϕ6of the six inner surfaces 145 a-145 f are different from each other andare all greater than the diameter ϕ0 of the object-side central hole144. Moreover, as shown in FIG. 1F and FIG. 1G, the object-side centralhole 144 and the inner surfaces 145 a-145 f of the carrier 140 areconfigured to form a barrel structure (its reference numeral isomitted), and an internal space (its reference numeral is omitted) isdefined by the inner surfaces 145 a-145 f for directly accommodating thelens assembly 150. Therefore, the volume of the carrier 140 can bereduced, the number of components and assembling steps can be reduced,and the production efficiency can be enhanced. Furthermore, the numberof the inner surfaces (145 a-145 f) in the 1st embodiment is onlyexemplary, and the present disclosure is not limited thereto. In otherembodiments, the number of the inner surfaces can be adjusted accordingto the number of the lens elements of the lens assembly.

Please refer to FIG. 1G and FIG. 1N. FIG. 1N is an enlarged view of aportion 1E′ shown in FIG. 1G. The object-side portion 143 of the carrier140 can include an annular side wall 145. The annular side wall 145surrounds the object-side central hole 144. The annular side wall 145includes a tip end structure 148 formed by an inclined plane 146 and aninclined plane 147. An included angle between the inclined plane 146 andthe optical axis O is A1, and A1 is greater than 0 degrees and less than90 degrees. An included angle between the inclined plane 147 and theoptical axis O is A2, and A2 is greater than 0 degrees and less than 90degrees. Therefore, the image quality of the lens assembly 150 disposedin the carrier 140 can be enhanced, so that the stability of the moldingquality of the carrier 140 can be enhanced. Accordingly, phenomena, suchas flash, sink and short shot, can be prevented.

In FIG. 1F and FIG. 1G, a portion of the carrier 140 surrounded by thecoil 170 can be disposed inside the metal yoke 120, and the object-sideportion 143 of the carrier 140 is exposed to an outside (its referencenumeral is omitted) of the metal yoke 120. Therefore, the extendingstructure 122 of the metal yoke 120 can be closer to the notch structure141 of the carrier 140. As a result, the notch structure 141 shielded bythe metal yoke 120, which will affect the efficiency of irradiationcuring of the damper precursor, can be prevented.

FIG. 1H is a cross-sectional view of the lens assembly 150 in FIG. 1F.In FIG. 1H, the lens assembly 150 can include at least three lenselements (151-156), and each of the lens elements (151-156) has an outerdiameter (od1-od6). The outer diameters of the at least three lenselements can be different from each other. According to the 1stembodiment, the number of the lens elements of the lens assembly 150 issix, in order from an object side (its reference numeral is omitted) toan image side (its reference numeral is omitted), the six lens elementsare a lens element 151, a lens element 152, a lens element 153, a lenselement 154, a lens element 155 and a lens element 156. An outerdiameter of the lens element 151 is od1. An outer diameter of the lenselement 152 is od2. An outer diameter of the lens element 153 is od3. Anouter diameter of the lens element 154 is od4. An outer diameter of thelens element 155 is od5. An outer diameter of the lens element 156 isod6. Specifically, the outer diameters od1-od6 of the lens elements151-156 can be corresponding to the diameters ϕ1-06 of the innersurfaces 145 a-145 f, which is favorable for directly accommodating thelens assembly 150 in the carrier 140. Moreover, the number and thestructure of the lens elements (151-156) in the 1st embodiment are onlyexemplary, and the present disclosure is not limited thereto. In otherembodiments, the number and the structure of the lens elements of thelens assembly can be adjusted according to the desired opticalfunctionalities.

FIG. 1I is a top view of the lens unit 130 in FIG. 1C. As shown in FIG.1E and FIG. 1I, in the assembled lens assembly driving module 100, theextending structure 122 of the metal yoke 120 is located in the notchstructure 141. Therefore, the extending structure 122 can be kept acertain distance with the notch structure 141. The certain distance isfavorable for coating the damper precursor between the extendingstructure 122 and the notch structure 141 without disconnection.

In FIG. 1J, when a distance between a bottom 141 a of the notchstructure 141 and the extending structure 122 perpendicular to theoptical axis O is d, the following condition can be satisfied: 0.002mm<d<0.6 mm. Therefore, the distance between the bottom 141 a of thenotch structure 141 and the extending structure 122 perpendicular to theoptical axis O is proper, which is favorable for controlling the coatingrange of the liquid damper precursor, and overflow or insufficient doseof the liquid damper precursor can be prevented. Accordingly, the useamount of the damper precursor can be reduced.

In FIG. 1E, when a number of the notch structure 141 is Nn, and a numberof the extending structure 122 is Ne, the following conditions can besatisfied: 2≤Nn≤6; and Nn=Ne. Therefore, the number of the notchstructure 141 and the extending structure 122 are proper. When thenumber is excessively large, the manufacturing efficiency of the metalyoke 120 is reduced. When the number is excessively small, thedistribution of the positions disposed with the damper agent 190 isuneven, which tends to cause the tilt of the carrier 140.

In FIG. 1E and FIG. 1I, when a width of the extending structure 122 isWy, and a width of the notch structure 141 is Wb, the followingcondition can be satisfied: 0.4<Wy/Wb<1.0. Therefore, an excessivechange of the width of the air space between the extending structure 122and the notch structure 141 can be prevented, which is favorable formaintaining an even air space.

In FIG. 1C, the magnet set 160 includes four magnets (reference numeralsthereof are omitted). However, the present disclosure is not limitedthereto. The magnet set 160 is for interacting with the coil 170 so asto generate the electromagnetic force. Therefore, the number and thearrangement of the magnets of the magnet set 160 can be adjustedaccording to practical demands.

In FIG. 1C, the elastic element includes the first elastic member 181and the second elastic member 182. The first elastic member 181 iscoupled with a portion of the lens unit 130 away from the holder 110,and the second elastic member 182 is coupled with a portion of the lensunit 130 close to the holder 110. Therefore, the lens unit 130 can besupported on the holder 110. Moreover, with the upper and lower assemblyof the first elastic member 181 and the second elastic member 182, thetilt of the lens unit 130 can be prevented. In the 1st embodiment, theelastic element has a total of two elastic members (i.e., the firstelastic member 181 and the second elastic member 182). However, thepresent disclosure is not limited thereto. The elastic element is forproviding the degree of freedom and the restoring force required by themovement of the lens unit 130. Accordingly, elastic elements which canprovide the aforementioned function can be employed in the presentdisclosure. In other words, the number and the structure of the elasticmembers of the elastic element can be adjusted according to practicaldemands.

In FIG. 1C, the second elastic member 182 can include two springs(reference numerals thereof are omitted). The two springs are separatedwith each other, and the two springs are arranged on a same horizontalplane. Specifically, the two springs are electrically separated witheach other. Therefore, the two springs can be employed as transmissionpath of current signals for the coil 170 (i.e., can be employed to sendcurrent signals required by the coil 170).

In FIG. 1E, the notch structure 141 and the damper agent 190 arecorresponding to the through hole 121 and are not shielded by the metalyoke 120 along a direction parallel to the optical axis O. Therefore, itis favorable for finding the injection position of the damper precursorfrom the outside of the metal yoke 120. Moreover, it can prevent toshield the light source of irradiation curing, which can enhance theprocess efficiency.

In FIG. 1E, the damper agent 190 is formed by the damper precursor curedvia a UV irradiation from the through hole 121. With directly receivingthe UV irradiation from the through hole 121, the difficulty ofirradiation curing can be reduced.

In FIG. 1E, when a number of the damper agent 190 disposed in the notchstructure 141 is Na, the following conditions can be satisfied: 2≤Na≤12;and Na is an even number. Therefore, a single notch structure 141 can bedisposed with a damper agent 190 or a plurality of the damper agents190, which is favorable for reducing the use amount of the damper agent190, reducing the cost and maintaining the effect for damping themovement of the lens unit 130.

According to the present disclosure, the damper precursor can be but isnot limited to a commercial product TB3168 (provided by Three BondInternational, Inc.). The commercial product TB3168 can be cured via aUV irradiation.

In the 1st embodiment, values of parameters d, Nn, Ne, Na, Wy, Wb, Wy/Wbare listed in Table 1.

TABLE 1 d[mm] 0.13 Wy [mm] 1.19 Nn 4 Wb [mm] 1.46 Ne 4 Wy/Wb 0.82 Na 4

2nd Embodiment

Please refer to FIG. 2A to FIG. 2D. FIG. 2A is a three-dimensional viewof a lens assembly driving module 200 according to the 2nd embodiment ofthe present disclosure. FIG. 2B is an exploded view of the lens assemblydriving module 200 in FIG. 2A. FIG. 2C is another exploded view of thelens assembly driving module 200 in FIG. 2A. FIG. 2D is a top view ofthe lens assembly driving module 200 in FIG. 2A. As shown in FIG. 2A toFIG. 2D, the lens assembly driving module 200 includes a holder 210, ametal yoke 220, a lens unit 230, a magnet set 260, a coil 270, at leastone elastic element (its reference numeral is omitted) and at least onedamper agent 290. Specifically, the metal yoke 220 is coupled with theholder 210 so as to form an accommodating space (its reference numeralis omitted). The accommodating space is configured to dispose the lensunit 230, the magnet set 260, the coil 270, the elastic element and thedamper agent 290.

The holder 210 has an opening 211. The metal yoke 220 includes a throughhole 221 and at least one extending structure 222. The through hole 221of the metal yoke 220 is corresponding to the opening 211 of the holder210. The extending structure 222 is disposed around the through hole221, and the extending structure 222 extends along a direction from thethrough hole 221 to the holder 210.

The lens unit 230 is movably disposed in the metal yoke 220. The lensunit 230 includes an optical axis O (shown in FIG. 2B) and at least onenotch structure 241. The optical axis O is corresponding to the throughhole 221. The notch structure 241 is disposed in an outer peripheralarea (its reference numeral is omitted) of the lens unit 230, and thenotch structure 241 is corresponding to the extending structure 222.Please refer to FIG. 2I and FIG. 2K. FIG. 2I is an enlarged view of aportion 2B′ shown in FIG. 2A. FIG. 2K is an enlarged view of a portion2D′ shown in FIG. 2B. The correspondence between the notch structure 241and the extending structure 222 is shown in FIG. 2I. The notch structure241 is shown in FIG. 2K.

The magnet set 260 is disposed in the metal yoke 220. The coil 270 isdisposed at an exterior of the lens unit 230, and the coil 270 iscorresponding to the magnet set 260.

The elastic element is coupled with the lens unit 230 and the holder210, respectively. Specifically, in FIG. 2B and FIG. 2C, the elasticelement includes a first elastic member 281 and a second elastic member282, wherein the first elastic member 281 is coupled with the lens unit230, and the second elastic member 282 is coupled with the lens unit 230and the holder 210, respectively. However, the present disclosure is notlimited thereto. The elastic element is for providing the degree offreedom and the restoring force required by the movement of the lensunit 230. Accordingly, elastic elements which can provide theaforementioned function can be employed in the present disclosure.

Please refer to FIG. 2D and FIG. 2N. FIG. 2N is an enlarged view of aportion 2G′ shown in FIG. 2D. The damper agent 290 is disposed betweenthe extending structure 222 of the metal yoke 220 and the notchstructure 241 of the lens unit 230, wherein the damper agent 290 isapplied to damp a movement of the lens unit 230.

The optical axis O is corresponding to the through hole 221, whichrefers that the optical axis O and the through hole 221 arecorresponding to each other in function. Specifically, thecorrespondence in function between the optical axis O and the throughhole 221 allows a portion of the lens unit 230 to pass through thethrough hole 221, so that light is not shielded and can enter into thelens unit 230. For example, the optical axis O can pass through thethrough hole 221, or the through hole 221 and the optical axis O can becoaxial.

The coil 270 is corresponding to the magnet set 260, which refers thatthe coil 270 and the magnet set 260 are corresponding to each other infunction. Specifically, the correspondence in function between the coil270 and the magnet set 260 allows an electromagnetic force generatedtherebetween. In this embodiment, a surface (its reference numeral isomitted) of the coil 270 faces toward to the magnet set 260, which canenhance the electromagnetic force therebetween.

Specifically, in a focusing process, an electronic signal is firstlyobtained by the lens assembly driving module 200 according to light ofan imaged object entering into the lens unit 230. The electronic signalis then sent to an electronic driver (not shown), and the electronicdriver provides a current to the coil 270. With an electromagnetic forcegenerated by the interaction of the magnet set 260 and the coil 270, thelens unit 230 is driven to move along the optical axis O, so that theautofocus functionality of the lens unit 230 can be achieved. In theabove focusing process, when the lens unit 230 is driven to move, adegree of freedom of the lens unit 230 along the optical axis O can beprovided by the first elastic member 281 and the second elastic member282. The first elastic member 281 and the second elastic member 282 aredeformed along the movement of the lens unit 230, and provide arestoring force to the lens unit 230 when the lens unit 230 moves backto an initial position thereof.

With the aforementioned structure, the arrangement of the extendingstructure 222 and the notch structure 241 is favorable for obtaining anexpected control for the coating amount and the coating efficiency ofthe damper agent 290. Moreover, the damper agent 290 is disposed closelyto the through hole 221, so that the production difficulty can besignificantly reduced. Furthermore, the damper agent 290 can be coatedby a multi-point coating process which is a faster coating method, andan equally damping effect for damping a movement of the lens unit 230can be obtained.

Details of the lens assembly driving module 200 according to the 2ndembodiment are provided hereinafter.

In FIG. 2B and FIG. 2C, the lens unit 230 can include a carrier 240 anda lens assembly 250. The lens assembly 250 can include a barrel (itsreference numeral is omitted) and at least three lens elements (only aportion of the lens element which is closest to the object side andexposes from the barrel is shown, and the reference numeral thereof isomitted). The at least three lens elements are disposed in the barrel.Each of the lens elements has an outer diameter. The outer diameters ofthe at least three lens elements can be different from each other. Thecarrier 240 is movably disposed in the metal yoke 220, and the lensassembly 250 is coupled in the carrier 240. A movement of the lensassembly 250 relative to the holder 210 is according to a movement ofthe carrier 240.

Please refer to FIG. 2E, FIG. 2F, FIG. 2G, FIG. 2O and FIG. 2P. FIG. 2Eis a three-dimensional view of the carrier 240 in FIG. 2B. FIG. 2F isanother three-dimensional view of the carrier 240 in FIG. 2B. FIG. 2G isa top view of the carrier 240 in FIG. 2B. FIG. 2O is an enlarged view ofa portion 2H′ shown in FIG. 2E. FIG. 2P is an enlarged view of a portion2I′ shown in FIG. 2E. As shown in FIG. 2E, FIG. 2F, FIG. 2G, FIG. 2O andFIG. 2P, the notch structure 241 is disposed in an outer peripheral area(its reference numeral is omitted) of the carrier 240, and the notchstructure 241 includes a broadwise notch structure 242.

Please refer to FIG. 2D, FIG. 2H, FIG. 2J and FIG. 2M. FIG. 2H is anenlarged view of a portion 2A′ shown in FIG. 2A. FIG. 2J is an enlargedview of a portion 2C′ shown in FIG. 2B. FIG. 2M is an enlarged view of aportion 2F′ shown in FIG. 2D. As shown in FIG. 2D, FIG. 2H, FIG. 2J andFIG. 2M, the extending structure 222 includes a broadwise extendingstructure 223, the notch structure 241 includes a broadwise notchstructure 242, and the broadwise extending structure 223 iscorresponding to the broadwise notch structure 242. The broadwise notchstructure 242 is exposed to an outside via the through hole 221, so thatpositions for injecting the damper agent 290 can be increased, and theusing amount of the damper agent 290 can be reduced.

FIG. 2L is an enlarged view of a portion 2E′ shown in FIG. 2B. As shownin FIG. 2L, a portion of the broadwise notch structure 242 close to thethrough hole 221 of the metal yoke 220 tapers along a direction towardthe holder 210. Therefore, the success rate of coating the damper agent290 can be enhanced, the quality of injecting the damper agent 290 canbe enhanced, and the overflow can be reduced.

In FIG. 2D, when an included angle between the broadwise extendingstructure 223 and the extending structure 222 is θ, the followingcondition can be satisfied: 95 degrees<θ<175 degrees. Therefore, anexcessive huge volume of the broadwise notch structure 242 can beavoided, and the strength of the broadwise extending structure 223 canbe maintained.

As shown in FIG. 2D and FIG. 2G, in the assembled lens assembly drivingmodule 200, the extending structure 222 of the metal yoke 220 is locatedin the notch structure 241. Therefore, the extending structure 222 canbe kept a certain distance with the notch structure 241. The certaindistance is favorable for coating the damper precursor between theextending structure 222 and the notch structure 241 withoutdisconnection.

In FIG. 2B, the magnet set 260 includes four magnets (reference numeralsthereof are omitted). However, the present disclosure is not limitedthereto. The magnet set 260 is for interacting with the coil 270 so asto generate the electromagnetic force. Therefore, the number and thearrangement of the magnets of the magnet set 260 can be adjustedaccording to practical demands.

In FIG. 2B, the elastic element includes the first elastic member 281and the second elastic member 282. The first elastic member 281 iscoupled with a portion of the lens unit 230 away from the holder 210,and the second elastic member 282 is coupled with a portion of the lensunit 230 close to the holder 210. Therefore, the lens unit 230 can besupported on the holder 210. Moreover, with the upper and lower assemblyof the first elastic member 281 and the second elastic member 282, thetilt of the lens unit 230 can be prevented. In the 2nd embodiment, theelastic element has a total of two elastic members (i.e., the firstelastic member 281 and the second elastic member 282). However, thepresent disclosure is not limited thereto. The elastic element is forproviding the degree of freedom and the restoring force required by themovement of the lens unit 230. Accordingly, elastic elements which canprovide the aforementioned function can be employed in the presentdisclosure. In other words, the number and the structure of the elasticmembers of the elastic element can be adjusted according to practicaldemands.

In FIG. 2B, the second elastic member 282 can include two springs(reference numerals thereof are omitted). The two springs are separatedwith each other, and the two springs are arranged on a same horizontalplane. Specifically, the two springs are electrically separated witheach other. Therefore, the two springs can be employed as transmissionpath of current signals for the coil 270 (i.e. can be employed to sendcurrent signals required by the coil 270).

In FIG. 2D, the notch structure 241 and the damper agent 290 arecorresponding to the through hole 221 and are not shielded by the metalyoke 220 along a direction parallel to the optical axis O. Furthermore,the damper agent 290 is formed by a damper precursor cured via a UVirradiation from the through hole 221.

In FIG. 2B and FIG. 2C, the lens assembly driving module 200 can includea sensing element 291 and another magnet set 292. The sensing element291 is disposed on the holder 210. The magnet set 292 includes twomagnets (reference numerals thereof are omitted), and the magnet set 292is disposed at an end of the carrier 240 close to the holder 210. Thesensing element 291 is corresponding to the magnet set 292. The sensingelement 291 is for sensing the change of the magnetic field of themagnet set 292. The sensing element 291 can be a Hall effect element.

In FIG. 2N, a distance between a bottom 241 a of the notch structure 241and the extending structure 222 perpendicular to the optical axis O isd. In FIG. 2D, a number of the notch structure 241 is Nn, a number ofthe extending structure 222 is Ne, a number of the damper agent 290disposed in the notch structure 241 is Na, a width of the extendingstructure 222 is Wy, and an included angle between the broadwiseextending structure 223 and the extending structure 222 is θ. In FIG.2G, a width of the notch structure 241 is Wb, and Wb does not includethe width of the broadwise notch structure 242. In the 2nd embodiment,values of parameters d, Nn, Ne, Na, Wy, Wb, Wy/Wb and θ are listed inTable 2.

TABLE 2 d[mm] 0.32 Wy [mm] 1.00 Nn 4 Wb [mm] 1.18 Ne 4 Wy/Wb 0.85 Na 6 θ[deg.] 135

3rd Embodiment

Please refer to FIG. 3A to FIG. 3C. FIG. 3A is a schematic view showinga cell phone device 10 according to the 3rd embodiment of the presentdisclosure. FIG. 3B is another schematic view of the cell phone device10 in FIG. 3A. FIG. 3C is a block diagram of the cell phone device 10 inFIG. 3A. Particularly, FIG. 3A and FIG. 3B are schematic views relatedto a camera of the cell phone device 10, and FIG. 3C is the blockdiagram related to the camera of the cell phone device 10. As shown inFIG. 3A and FIG. 3B, the cell phone device 10 of the 3rd embodiment is asmart phone, wherein the cell phone device 10 includes a photographingsystem 11, and the photographing system 11 includes the lens assemblydriving module 12 according to the present disclosure and an imagesensor 13. The image sensor 13 is disposed on an image surface (notshown herein) of the lens assembly (its reference numeral is omitted) ofthe lens assembly driving module 12 for receiving an imaging light fromthe lens assembly. Therefore, the requirement of compactness for currentelectronic devices can be satisfied.

The cell phone device 10 can further include at least one sensingelement 16, at least one auxiliary optical component 17, an image signalprocessor (ISP) 18, a user interface 19, a circuit board 77 and aconnector 78, wherein the user interface 19 includes a touch screen 19 aand a button 19 b.

Furthermore, the user activates the capturing mode via the userinterface 19 (the touch screen 19 a or the button 19 b) of the cellphone device 10. At this moment, the imaging light is converged on theimage sensor 13 by the lens assembly driving module 12, and theelectronic signal associated with image is output to the image signalprocessor 18.

The auxiliary optical component 17 can be a flash module forcompensating color temperature, an infrared distance measurementcomponent, a laser focus module, etc. The sensing element 16 can havefunctions for sensing physical momentum and kinetic energy, such as anaccelerator, a gyroscope, a Hall effect element, to sense shaking orjitters applied by hands of the user or external environments.Accordingly, the functions of the lens assembly driving module 12 of thephotographing system 11 can be enhanced to achieve the superior imagequality. Furthermore, the cell phone device 10 according to the presentdisclosure can have a capturing function with multiple modes, such astaking optimized selfies, high dynamic range (HDR) under a low lightcondition, 4K resolution recording, etc. Additionally, the user canvisually see the captured image of the camera through the touch screen19 a and manually operate the view finding range on the touch screen 19a to achieve the autofocus function of what you see is what you get.

Furthermore, as shown in FIG. 3B, the photographing system 11, thesensing element 16 and the auxiliary optical component 17 can bedisposed on the circuit board 77 (the circuit board 77 is a flexibleprinted circuit board, FPC) and electrically connected with theassociated components, such as the imaging signal processor 18, via theconnector 78 to perform a capturing process. Since current electronicdevices, such as smart phones, have a tendency of being compact. In the3rd embodiment, the way of firstly disposing the photographing system 11and related components on the flexible printed circuit board 77 andsecondly integrating the circuit thereof into the main board of the cellphone device 10 via the connector 78 can satisfy the mechanical designof the limited space inside the cell phone device 10 and the layoutrequirements and obtain more margins. The autofocus function of thephotographing system 11 can also be controlled more flexibly via thetouch screen 19 a of the cell phone device 10. In other embodiments (notshown herein), the sensing element 16 and the auxiliary opticalcomponent 17 can also be disposed on the main board of the cell phonedevice 10 or carrier boards of other types according to requirements ofthe mechanical design and the circuit layout.

In addition, the cell phone device 10 can further include but not belimited to a wireless communication unit, a control unit, a storageunit, a random access memory (RAM), a read-only memory (ROM), or acombination thereof.

4th Embodiment

FIG. 4 is a schematic view of a cell phone device 20 according to the4th embodiment of the present disclosure. As shown in FIG. 4, the cellphone device 20 of the 4th embodiment is a smart phone, wherein the cellphone device 20 includes a photographing system 21 a and a photographingsystem 21 b. The photographing system 21 a includes a lens assemblydriving module 22 a and an image sensor (not shown). The image sensor isdisposed on an image surface (not shown) of the lens assembly (itsreference numeral is omitted) of the lens assembly driving module 22 afor receiving an imaging light from the lens assembly. The photographingsystem 21 b includes a lens assembly driving module 22 b and an imagesensor (not shown). The image sensor is disposed on an image surface(not shown) of the lens assembly (its reference numeral is omitted) ofthe lens assembly driving module 22 b for receiving an imaging lightfrom the lens assembly.

Moreover, at least one of the lens assembly driving module 22 a and thelens assembly driving module 22 b is the lens assembly driving moduleaccording to the present disclosure. The optical properties of the lensassemblies of the lens assembly driving module 22 a and the lensassembly driving module 22 b can be the same or different. During thecapturing process of the cell phone device 20, with the aid of theauxiliary optical component 27, two images can be obtained by thephotographing system 21 a and the photographing system 21 b, theneffects, such as a zoom effect and an exquisite effect, can be providedby the processing element (such as the imaging signal processor 28) ofthe cell phone device 20.

Details of the auxiliary optical component 27 can refer to that of theauxiliary optical component 17 of the 3rd embodiment, and are notdescribed herein.

5th Embodiment

FIG. 5 is a schematic view of a cell phone device 30 according to the5th embodiment of the present disclosure. As shown in FIG. 5, the cellphone device 30 of the 5th embodiment is a smart phone, wherein the cellphone device 30 includes a photographing system 31 a, a photographingsystem 31 b and a photographing system 31 c. The photographing system 31a includes a lens assembly driving module 32 a and an image sensor (notshown). The image sensor is disposed on an image surface (not shownherein) of the lens assembly (its reference numeral is omitted) of thelens assembly driving module 32 a for receiving an imaging light fromthe lens assembly. The photographing system 31 b includes a lensassembly driving module 32 b and an image sensor (not shown). The imagesensor is disposed on an image surface (not shown) of the lens assembly(its reference numeral is omitted) of the lens assembly driving module32 b for receiving an imaging light from the lens assembly. Thephotographing system 31 c includes a lens assembly driving module 32 cand an image sensor (not shown). The image sensor is disposed on animage surface (not shown herein) of the lens assembly (its referencenumeral is omitted) of the lens assembly driving module 32 c forreceiving an imaging light from the lens assembly.

Moreover, at least one of the lens assembly driving module 32 a, thelens assembly driving module 32 b and the lens assembly driving module32 c is the lens assembly driving module according to the presentdisclosure. The optical properties of the lens assemblies of the lensassembly driving module 32 a, the lens assembly driving module 32 b andthe lens assembly driving module 32 c can be the same or different.During the capturing process of the cell phone device 30, with the aidof the auxiliary optical component 37, three images can be obtained bythe photographing system 31 a, the photographing system 31 b and thephotographing system 31 c, then effects, such as a zoom effect and anexquisite effect, can be provided by the processing element (such as theimaging signal processor 38) of the cell phone device 30.

Details of the auxiliary optical component 37 can refer to that of theauxiliary optical component 17 of the 3rd embodiment, and are notdescribed herein.

Although the present disclosure has been described in considerabledetail with reference to certain embodiments thereof, other embodimentsare possible. Therefore, the spirit and scope of the appended claimsshould not be limited to the description of the embodiments containedherein.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentdisclosure without departing from the scope or spirit of the disclosure.In view of the foregoing, it is intended that the present disclosurecover modifications and variations of this disclosure provided they fallwithin the scope of the following claims.

What is claimed is:
 1. A lens assembly driving module, comprising: aholder having an opening; a metal yoke coupled with the holder andcomprising: a through hole corresponding to the opening of the holder;and at least one extending structure disposed around the through hole,wherein the extending structure extends along a direction from thethrough hole to the holder; a lens unit movably disposed in the metalyoke and comprising: an optical axis corresponding to the through hole;and at least one notch structure disposed in an outer peripheral area ofthe lens unit and corresponding to the extending structure; a magnet setdisposed in the metal yoke; a coil disposed at an exterior of the lensunit and corresponding to the magnet set; at least one elastic elementcoupled with the lens unit and the holder; and at least one damper agentdisposed between the extending structure of the metal yoke and the notchstructure of the lens unit, wherein the damper agent is applied to dampa movement of the lens unit; wherein a distance between a bottom of thenotch structure and the extending structure perpendicular to the opticalaxis is d, and the following condition is satisfied: 0.002 mm<d<0.6 mm.2. The lens assembly driving module of claim 1, wherein the notchstructure and the damper agent are corresponding to the through hole andare not shielded by the metal yoke along a direction parallel to theoptical axis.
 3. The lens assembly driving module of claim 2, whereinthe damper agent is formed by a damper precursor cured via a UVirradiation from the through hole.
 4. The lens assembly driving moduleof claim 3, wherein the extending structure is formed in a flat shape.5. The lens assembly driving module of claim 1, wherein the elasticelement comprises a first elastic member and a second elastic member,the first elastic member is coupled with a portion of the lens unit awayfrom the holder, and the second elastic member is coupled with a portionof the lens unit close to the holder.
 6. The lens assembly drivingmodule of claim 5, wherein the second elastic member comprises twosprings, the two springs are separated with each other, and the twosprings are arranged on a same horizontal plane.
 7. The lens assemblydriving module of claim 1, wherein the lens unit further comprises: acarrier movably disposed in the metal yoke, wherein the notch structureis disposed in an outer peripheral area of the carrier, and the carriercomprises: an object-side portion having an object-side central hole;and at least three inner surfaces, wherein each of the inner surfaceshas a diameter, the diameters of the inner surfaces are different fromeach other, and each of the diameters of the inner surfaces is greaterthan a diameter of the object-side central hole; and a lens assembly,wherein the optical axis is defined by the lens assembly, the opticalaxis is corresponding to the object-side central hole, and the lensassembly comprises: at least three lens elements, each of the lenselements has an outer diameter, the outer diameters of the lens elementsare different from each other, the lens assembly is coupled in thecarrier, and a movement of the lens assembly relative to the holder isaccording to a movement of the carrier.
 8. The lens assembly drivingmodule of claim 7, wherein the object-side portion of the carriercomprises an annular side wall surrounding the object-side central hole,the annular side wall comprises a tip end structure formed by twoinclined planes, and an included angle between each of the inclinedplanes and the optical axis is greater than 0 degrees and less than 90degrees.
 9. The lens assembly driving module of claim 7, wherein aportion of the carrier surrounded by the coil is disposed inside themetal yoke, and the object-side portion of the carrier is exposed to anoutside of the metal yoke.
 10. The lens assembly driving module of claim1, wherein a number of the notch structure is Nn, a number of theextending structure is Ne, and the following conditions are satisfied:2≤Nn≤6; and Nn=Ne.
 11. The lens assembly driving module of claim 10,wherein a number of the damper agent disposed in the notch structure isNa, and the following conditions are satisfied: 2≤Na≤12; and Na is aneven number.
 12. The lens assembly driving module of claim 1, wherein awidth of the extending structure is Wy, a width of the notch structureis Wb, and the following condition is satisfied: 0.4<Wy/Wb<1.0.
 13. Thelens assembly driving module of claim 1, wherein the extending structurecomprises a broadwise extending structure, the notch structure comprisesa broadwise notch structure, and the broadwise extending structure iscorresponding to the broadwise notch structure.
 14. The lens assemblydriving module of claim 13, wherein a portion of the broadwise notchstructure close to the through hole of the metal yoke tapers along adirection toward the holder.
 15. The lens assembly driving module ofclaim 13, wherein an included angle between the broadwise extendingstructure and the extending structure is θ, and the following conditionis satisfied: 95 degrees<θ<175 degrees.
 16. A photographing system,comprising: the lens assembly driving module of claim
 1. 17. A cellphone device, comprising: the photographing system of claim 16.